Koordinaten aus der Skizze ablesen. Dabei festlegen das z.B. D der Ursprung ist.
A = [6, 0, 0] ; B = [6, 6, 0] ; C = [0, 6, 0] ; D = [0, 0, 0] ; S = [3, 3, 6]
M = C + 1/2·CS = [0, 6, 0] + 1/2·([3, 3, 6] - [0, 6, 0]) = [1.5, 4.5, 3]
N = A + 2/3·AS = [6, 0, 0] + 2/3·([3, 3, 6] - [6, 0, 0]) = [4, 2, 4]
P = A + r·AM = C + s·CN
P = [6, 0, 0] + r·([1.5, 4.5, 3] - [6, 0, 0]) = [0, 6, 0] + s·([4, 2, 4] - [0, 6, 0]) → r = 4/5 ∧ s = 3/5
P = [6, 0, 0] + 4/5·([1.5, 4.5, 3] - [6, 0, 0]) = [2.4, 3.6, 2.4]